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diff --git a/include/binder/MemoryHeapBase.h b/include/binder/MemoryHeapBase.h
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+++ b/include/binder/MemoryHeapBase.h
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_MEMORY_HEAP_BASE_H
+#define ANDROID_MEMORY_HEAP_BASE_H
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <binder/IMemory.h>
+
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class MemoryHeapBase : public virtual BnMemoryHeap 
+{
+public:
+    enum {
+        READ_ONLY = IMemoryHeap::READ_ONLY,
+        MAP_ONCE = IMemoryHeap::MAP_ONCE,
+        // memory won't be mapped locally, but will be mapped in the remote
+        // process.
+        DONT_MAP_LOCALLY = 0x00000100
+    };
+
+    /* 
+     * maps the memory referenced by fd. but DOESN'T take ownership
+     * of the filedescriptor (it makes a copy with dup()
+     */
+    MemoryHeapBase(int fd, size_t size, uint32_t flags = 0);
+    
+    /*
+     * maps memory from the given device
+     */
+    MemoryHeapBase(const char* device, size_t size = 0, uint32_t flags = 0);
+
+    /*
+     * maps memory from ashmem, with the given name for debugging
+     */
+    MemoryHeapBase(size_t size, uint32_t flags = 0, char const* name = NULL);
+
+    virtual ~MemoryHeapBase();
+
+    /* implement IMemoryHeap interface */
+    virtual int         getHeapID() const;
+    virtual void*       getBase() const;
+    virtual size_t      getSize() const;
+    virtual uint32_t    getFlags() const;
+
+    const char*         getDevice() const;
+    
+    /* this closes this heap -- use carefully */
+    void dispose();
+
+    /* this is only needed as a workaround, use only if you know
+     * what you are doing */
+    status_t setDevice(const char* device) {
+        if (mDevice == 0)
+            mDevice = device;
+        return mDevice ? NO_ERROR : ALREADY_EXISTS;
+    }
+    
+protected:
+            MemoryHeapBase();
+    // init() takes ownership of fd
+    status_t init(int fd, void *base, int size,
+            int flags = 0, const char* device = NULL);    
+
+private:
+    status_t mapfd(int fd, size_t size);
+
+    int         mFD;
+    size_t      mSize;
+    void*       mBase;
+    uint32_t    mFlags;
+    const char* mDevice;
+    bool        mNeedUnmap;
+};
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_MEMORY_HEAP_BASE_H